Plan 1

My in laws have a cabin in Island Park ID. Mack's Inn to be more specific. We could head up there, stopping along the way raiding wherever we can for whatever we can carry. My mom live about halfway there in Rexburg, so we could wait it out there for a while two.
There is an old abandoned ranger tower about 45 min away from the cabin on ATV. I will already have it loaded with ammo and food, and I would have a rain collection system for water. We could hold up there for a while killing the zombies that collect at the bottom and raid the surrounding homes for food and ammo.
The only thing is that we are a long way away from population and stores so we will be heavily relying on what we bring the first time around.